Need this key cut? See our High Security Key cut service http://www.autotransponder.com/high_security_laser_key_cut_service 2003 LEXUS SC430 key shell is meant for customers who have a working remote head key that is cracked or broken. You do not need to purchase the complete key if your remote functions are working normally. The blade is molded into the plastic head on remote head keys, so it must be cut to match your original key before you can use it. Not all locksmiths or dealerships have the proper equipment to cut high security key shell for 2003 LEXUS SC430 , so you will need to call around before purchasing. If you are unable to find anyone to cut the key for you, we offer a key cutting service for $29.95. Please see the listing In Lexus category for more information. Once the new key shell is cut you can remove the remote part from your original key, place it into the new shell and it will work just as normal. The new shell will NOT start the vehicle without the original remote part inside of it.